regular and shadow header and testsuite patch

[Steven King]

  Attached are 2 patches.  Patch 1 fixes a few problems in the both the
regular and shadow headers.  With it applied, I get a pass/fail of 170/12 for
the normal (non-shadow-header) configuration.

  Patch 2 fixes a few problems with the testsuite that cause a number of
failures when shadow headers are enabled.  With it applied (and some grotty
hackery for the signal.h mess which I'm not including), I get a pass/fail of
170/12 for shadow-header configuration.  However, it also correctly detects a
number of non-conformances in the non-shadow configuration, that is, the
non-shadow headers now have a bunch more failures...